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(No Model.) 2 Sheets-Sheet 1.

'1-1. B. ROBERTS. STEAM GENERATOR.

No. 507,505. Patented Oct. 24, 1893.

(No Moi ieL') I 2 sheets-sheen 2-.

E. E. ROBERTS. STEAMGE-NERATOR.

No. 507,505. Patented Oct. 24, 1893..

2x7 0oz ve'nbq 6 35 I aftozme I h 1g 3411M UNITED STATES PATENT OFFICE.

EDWARD E. ROBERTS, OF RED BANK, NEW JERSEY, ASSIGNOR TO THE ROBERTSSAFETY WATER TUBE BOILER COMPANY, OF SAME PLACE.

STEAM-G EN ERATO R.

SPECIFICATION forming part of Letters Patent NO. 507,505, dated October24, 1893. Application filed January 4, 1392. Renewed May 27, 1893-Serial No. 475.797. (No model.)

To aZZ whom it may concern:

Be it known that I, EDWARD E. ROBERTS, residing at Red Bank, county ofMonmouth, and State of New Jersey, have invented certain new and usefulImprovements in Steam- Generators, of which the following is aspecification.

This invention relates generally to steam generators, and moreparticularly to an improvement on that form of boiler set forth andshown in Letters Patent No. 371,710, granted to me October 18, 1887.

The object of the present improvements is to provide an eflicient andcomparatively inexpensive generator, and in which the various parts maybe readily renewed should occasio require.

To this end, it consists in the novel structure hereinafter fully setforth.

The accompanying .drawings illustrate so much of a boiler as isnecessary to a perfect understanding of the invention; in which drawingsFigure 1 is a sectional elevation; Fig. 2, a side View. Fig. 3, is adiagram of a modified form.

The generator embodying the improvements consists of a steam and waterdrum A, two lower water drums B, B, down flow pipes 0, connecting thesteam and water drum with each of the lower water drums, and a series ofsets of transversely arranged return tubes D, connecting the lower waterdrums B, B, with the steam and water drum A. The steam and water drummay be of the usual form, arranged horizontally of the generator overthe grate E, from the two opposite ends of which drum and at a point ator near its bottom there leads the down flow pipes G, extending to andconnecting with the lower water drums B, B, arranged upon opposite sidesof the grate, whereby each end of the upper drum is connected with eachend of the two lower drums, as in my said patent. The down flow pipesmay be arranged in any suitable manner and may extend by right angularconnections or by the direct inclined connections shown.

The sets of return tubes D extend transversely across and above thegrate E, and

lead from a vertical header G, and thence into a horizontal orsubstantially horizontal header H. The vertical header G is inconnection by a short pipe g, with the lower drum B, while thelongitudinal header H is connected directly with the side of the steamand water drum A. A similar set of return tubes extends in a. likemanner, but in an opposite direction from a vertical header G, connectedby a short pipe g with the lower water drum B, and thence into asubstantially horizontal header H, connected directly with the side ofthe drum A, opposite the like header H. The two ends of the short pipesg and g will be right and left screw threaded, so as to facilitate theremoval of the headers and the connected sets of tubes. There will be anumber of sets of these return tubes D, depending upon the lengthof thegenerator, the sets extendingtransversely to the right alternating withthose extending to the left. Each of the horizontal headers H and Hinstead of being secured directly to the water drum may have interposedshort pipes h and h which have right and left screw threaded ends topermit the ready removal of the headers with the connected sets oftubes, by which and the pipes g, g, any pair of headers and their set oftubes may be removed from the boiler without dismantling it.

Each of the sets of return tubes D consist of the horizontal orsubstantially horizontal portions (1, and the substantially verticalportions d.

From the foregoing it will be understood that a constant circulation ofwater is kept up from and back into the steam and water drum. Thus theflow will be from both ends of the drum A down the down flow pipes Ginto the opposite ends of each of the lower drums B, B, and thence bythe vertical headers G, G, sets of return tubes D and horizontal headersH, H, back into said drum A.

The precise arrangement of the headers and their connecting tubes thusfar described may be modified somewhat by inclining the headers H, H,and similarly inclining the sets of tubes D, as shown in Fig. 3, withoutdeparting from the spirit of the invention. The

headers H, Il', may be horizontal, with the vertical portions clvertical instead of inclined as in dotted lines.

The joints between the headers H, H, and the connecting pipes and thedrum A, and between the sets of tubes and the headers may obviously bescrew or expanded joints, according as may be deemed best. The midportion of each of the lower drums B, B may have in addition to or inlieu of the usual end pockets a sediment pocket I, with a blow off valve1', for the collection or removal of any impurities that may collect inthe boiler.

What is claimed is 1. In a steam generator, the combination with thesteam and water drum, the two lower drums and the connecting downflowpipes, of a series of alternating sets of return tubes each setconnected at one end to a vertical header in communication with on e ofthe lower drums and the opposite end with a substantially horizontalheader in turn connected with the steam and water drum,substantially asdescribed.

:3. In a steam generator, the combination with the steam and water drum,the lower water drums and the connecting down flow pipes, of a series ofalternating sets of return tubes consisting of horizontal and verticalportions, vertical headers in communication with the lower water drumswith which the horizontal portions connect, and horizontal headers incommunication with the steam and water drum with which the verticalportions of said sets of tubes connect, substantially as described.

EDWARD E. ROBERTS.

NVitnesses:

GEO. II. GRAHAM, N. MARLER.

